A well-scoped mobile app takes 3 to 6 months from idea to launch. Simple apps can ship in 8–10 weeks; complex, data-heavy apps with a custom backend can take 6+ months.
How long does it take to build a mobile app? For a well-scoped product, expect 3 to 6 months from idea to launch. A simple app can ship in 8–10 weeks; a complex, data-heavy app with backend infrastructure can take 6 months or more. The timeline depends far more on scope and decision speed than on the platform itself — and understanding the phases helps you plan a launch you can actually hit.
The phases of mobile app development
Every app moves through the same four phases. Knowing what happens in each — and how long it takes — is the difference between a launch date you set on purpose and one you keep pushing back.
| Phase | Typical duration | What happens |
|---|---|---|
| Discovery & design | 2 – 4 weeks | Define the core journey, wireframe, and design the interface. |
| Core development | 6 – 16 weeks | Build screens, logic, backend, and data. The bulk of the work. |
| Testing & polish | 2 – 4 weeks | Real-device testing, edge cases, performance, and refinement. |
| Store submission | 2 days – 2 weeks | App Store / Play Store review and launch. |
1. Discovery & design — 2 to 4 weeks
Before any code, you define the core user journey, wireframe the screens, and design the interface. Skipping this phase is the number-one cause of expensive rebuilds later, because changing a design in Figma takes minutes while changing it in built code takes days. Good design work here quietly saves you months down the line.
2. Core development — 6 to 16 weeks
This is where the app is actually built: screens, navigation, business logic, the backend API, and data storage. Offline support, push notifications, payments, and real-time features each add time. Building for iOS and Android at once with a cross-platform framework like Flutter or React Native is usually faster than two separate native builds.
3. Testing & polish — 2 to 4 weeks
Real devices, edge cases, performance tuning, and the small interactions that make an app feel trustworthy. This phase is the most commonly underestimated, and it's exactly what separates a shippable app from a polished one that earns five-star reviews.
4. App Store submission — a few days to 2 weeks
Apple's App Store review typically takes 1–3 days but can be longer for a first submission or if changes are requested. Google Play is usually faster. Building this buffer into your launch plan avoids a marketing campaign that goes live before the app does.
Slow decisions. Apps rarely run late because engineering is slow — they run late because feedback, approvals, and scope changes pile up. A responsive stakeholder who answers questions within a day is the cheapest way to ship faster.
What makes an app faster or slower to build
- Cross-platform (Flutter / React Native) is usually faster than maintaining two native codebases.
- A clear, frozen scope ships far faster than a moving target that changes every week.
- Reusing proven backend infrastructure beats building every service from scratch.
- Complex features — real-time sync, offline-first, video, payments, AI — each add weeks.
- Design that's finished before development starts prevents costly mid-build rework.
- A single team that designs and builds together avoids the delays of hand-offs.
A realistic timeline for a typical app
For a mid-complexity consumer app — say, an app with accounts, a handful of core screens, a backend, and push notifications — a realistic end-to-end timeline is 16 to 20 weeks: about three weeks of design, twelve to fourteen weeks of development, three weeks of testing and polish, and a week for store submission. Front-loading design and keeping scope disciplined is what keeps that timeline honest.
The fastest way to build an app is to build the right app once — not the wrong app quickly and then rebuild it.
Teak Software Studio designs and builds iOS and Android apps for clients across the US and Europe, including SaveFirst, an AI-powered personal finance app for iOS. If you have an app in mind and want a realistic timeline mapped to your actual scope, we're happy to work it out with you.
Frequently asked questions
How long does it take to build a mobile app?
A well-scoped mobile app typically takes 3 to 6 months from idea to launch. Simple apps can ship in 8–10 weeks, while complex apps with custom backends and real-time features can take 6 months or more.
Is it faster to build for iOS or Android?
Neither platform is inherently faster. Building for both at once using a cross-platform framework like Flutter or React Native is usually quicker and cheaper than maintaining two separate native codebases.
How long does App Store approval take?
Apple's App Store review usually takes 1 to 3 days, though a first submission or one requiring changes can take longer. Google Play review is typically faster, often within a day.
What's the longest phase of app development?
Core development is the longest phase, typically 6 to 16 weeks, because it's where all the screens, logic, backend, and data work happen. Discovery, testing, and store submission are shorter but skipping them causes expensive delays later.